package com.paradogs.framework.core.utils;

import lombok.Getter;
import org.springframework.aop.framework.AopContext;
import org.springframework.aop.support.AopUtils;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.context.*;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.stereotype.Component;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 * spring工具类 方便在非spring管理环境中获取bean
 * 
 * @author ruoyi
 */
@Component
public final class SpringUtils implements BeanFactoryPostProcessor, ApplicationContextAware
{
    /** Spring应用上下文环境 */
    @Getter
    private static ConfigurableListableBeanFactory beanFactory;

    @Getter
    private static ApplicationContext applicationContext;


    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException
    {
        SpringUtils.beanFactory = beanFactory;
    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        SpringUtils.applicationContext = applicationContext;
    }

    /**
     * 获取对象
     *
     * @param name
     * @return Object 一个以所给名字注册的bean的实例
     * @throws BeansException
     *
     */
    @SuppressWarnings("unchecked")
    public static <T> T getBean(String name) throws BeansException
    {
        return (T) beanFactory.getBean(name);
    }

    /**
     * 获取类型为requiredType的对象
     *
     * @param clz
     * @return
     * @throws BeansException
     *
     */
    public static <T> T getBean(Class<T> clz) throws BeansException
    {
        T result = (T) beanFactory.getBean(clz);
        return result;
    }

    public static <T> T getBean(Class<T> clz, Object... args) throws BeansException
    {
        T result = (T) beanFactory.getBean(clz, args);
        return result;
    }

    public static <T> Map<String, T> getBeans(Class<T> clz) throws BeansException
    {
        return SpringUtils.beanFactory.getBeansOfType(clz);
    }

    public static <T extends Annotation> Map<String, Object> getBeansWithAnnotation(Class<T> clz) {
        return SpringUtils.beanFactory.getBeansWithAnnotation(clz);
    }

    /**
     * 待优化：缓存
     */
    public static <T extends Annotation> List<Method> getMethodsWithAnnotation(Class<T> clz) {
        List<Method> loopMethod = new ArrayList<>();
        for (Object bean : SpringUtils.getAllBeans().values()) {
            for (Method method : AopUtils.getTargetClass(bean).getDeclaredMethods()) {
                if (AnnotationUtils.findAnnotation(method, clz) != null) {
                    loopMethod.add(method);
                }
            }
        }
        return loopMethod;
    }

    public static Map<String, Object> getAllBeans() throws BeansException
    {
        return beanFactory.getBeansOfType(Object.class);
    }



    /**
     * 如果BeanFactory包含一个与所给名称匹配的bean定义，则返回true
     *
     * @param name
     * @return boolean
     */
    public static boolean containsBean(String name)
    {
        return beanFactory.containsBean(name);
    }

    /**
     * 判断以给定名字注册的bean定义是一个singleton还是一个prototype。 如果与给定名字相应的bean定义没有被找到，将会抛出一个异常（NoSuchBeanDefinitionException）
     *
     * @param name
     * @return boolean
     * @throws NoSuchBeanDefinitionException
     *
     */
    public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException
    {
        return beanFactory.isSingleton(name);
    }

    /**
     * @param name
     * @return Class 注册对象的类型
     * @throws NoSuchBeanDefinitionException
     *
     */
    public static Class<?> getType(String name) throws NoSuchBeanDefinitionException
    {
        return beanFactory.getType(name);
    }

    /**
     * 如果给定的bean名字在bean定义中有别名，则返回这些别名
     *
     * @param name
     * @return
     * @throws NoSuchBeanDefinitionException
     *
     */
    public static String[] getAliases(String name) throws NoSuchBeanDefinitionException
    {
        return beanFactory.getAliases(name);
    }

    /**
     * 获取aop代理对象
     *
     * @param invoker
     * @return
     */
    @SuppressWarnings("unchecked")
    public static <T> T getAopProxy(T invoker) {
        return (T) AopContext.currentProxy();
    }

}
